The study of the relation between the exchange rates regime and international trade is done using an inter-disciplinary vision that contains knowledge from four different disciplines: economics, history, mathematics and computer sciences. In the case of pure theory of international trade, there is made an abstraction of the fact that international trade is done using money. The theoretical analysis of international trade including the monetary factor deals with static equilibrium and linear models. We conceived a macroeconomic model of the world economy and used this model to make three simulation experiments. The conclusion of these experiments is that a broader exchange rate band has a negative impact over the volume of world trade. This conclusion is confirmed by the historical analysis.